body{_background-image:url(about:blank);_background-attachment:fixed}#backTop{position:fixed;_position:absolute;left:50%;bottom:50px;_top:expression((document).documentElement.clientHeight+document.documentElement.scrollTop-80);margin-left:480px;display:none;z-index:100}#backTop a{display:block;height:50px;width:50px;outline:0;background:#F5F6F7 url(/static/lv2/widget/backtop-new/img/w-back-normal_bbc4bf4.png?__sprite) 0 0 no-repeat}#backTop a:hover{background:#1C81E5 url(/static/lv2/widget/backtop-new/img/w-back-hover_9654fee.png?__sprite) 0 0 no-repeat}